A Porous Li–Al Alloy Anode toward High-Performance Sulfide-Based All-Solid-State Lithium Batteries,Advanced Materials

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A Porous Li–Al Alloy Anode toward High-Performance Sulfide-Based All-Solid-State Lithium Batteries
Advanced Materials ( IF 27.4 ) Pub Date : 2024-08-11 , DOI: 10.1002/adma.202407128
Jinhui Zhu ₁ , Jiayao Luo _{1,

2} , Jingyan Li _{1,

2} , Senhe Huang ₁ , Haozhe Geng ₁ , Zhenying Chen ₁ , Linan Jia ₃ , Yongzhu Fu ₂ , Xi Zhang ₃ , Xiaodong Zhuang _{1,

4}

Affiliation

Compared to lithium (Li) anode, the alloy/Li-alloy anodes show more compatible with sulfide solid electrolytes (SSEs), and are promising candidates for practical SSE-based all-solid-state Li batteries (ASSLBs). In this work, a porous Li–Al alloy (LiAl-p) anode is crafted using a straightforward mechanical pressing method. Various characterizations confirm the porous nature of such anode, as well as rich oxygen species on its surface. To the best knowledge, such LiAl-p anode demonstrates the best room temperature cell performance in comparison with reported Li and alloy/Li-alloy anodes in SSE-based ASSLBs. For example, the LiAl-p symmetric cells deliver a record critical current density of 6.0 mA cm⁻² and an ultralong cycling of 5000 h; the LiAl-p|LiNi_0.8Co_0.1Mn_0.1O₂ full cells achieve a high areal capacity of 11.9 mAh cm⁻² and excellent durability of 1800 cycles. Further in situ and ex situ experiments reveal that the porous structure can accommodate volume changes of LiAl-p and ensure its integrity during cycling; and moreover, a robust Li inorganics-rich solid electrolyte interphase can be formed originated from the reaction between SSE and surface oxygen species of LiAl-p. This study offers inspiration for designing high-performance alloy anodes by focusing on designing special architecture to alleviate volume change and constructing stable interphase.

中文翻译：

高性能硫化物基全固态锂电池的多孔锂铝合金负极

与锂（Li）负极相比，合金/锂合金负极与硫化物固体电解质（SSE）具有更好的相容性，并且是基于SSE的实用全固态锂电池（ASSLB）的有希望的候选者。在这项工作中，采用简单的机械压制方法制作了多孔锂铝合金（LiAl-p）阳极。各种特征证实了这种阳极的多孔性质，以及其表面丰富的氧物质。据了解，与报道的基于 SSE 的 ASSLB 中的锂和合金/锂合金阳极相比，这种 LiAl-p 阳极表现出最佳的室温电池性能。例如，LiAl-p对称电池可提供创纪录的6.0 mA cm ^-2临界电流密度和5000小时的超长循环； LiAl-p|LiNi _0.8 Co _0.1 Mn _0.1 O ₂全电池实现了11.9 mAh cm ^-2的高面积容量和1800次循环的优异耐久性。进一步的原位和异位实验表明，多孔结构可以适应LiAl-p的体积变化并确保其在循环过程中的完整性；此外，SSE与LiAl-p表面氧物质之间的反应可以形成坚固的富含Li无机物的固体电解质界面。这项研究通过重点设计特殊结构来减轻体积变化和构建稳定的界面，为设计高性能合金阳极提供了灵感。

更新日期：2024-08-11

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